Two men have been charged after fighting broke out during the FA Cup semi-final at Wembley Stadium.
Fourteen people were arrested on Saturday at the ground. Twelve of those arrested were Millwall fans and two were Wigan supporters, police said.
Det Ch Insp Andy Barnes said: "The violence seen at the Millwall v Wigan FA Cup fixture over the weekend is completely unacceptable.
"A significant investigation is now under way to identify all involved in order to bring them to justice in a swift and robust manner."